Does anyone know how nicotine leaves the body?

I was reading the Allen Carr book and he says that nicotine leaves the body then you crave for more. I am confused about how nocotine leaves the body??

It goes out in our sweat, pee, and it takes 48-72 hours for it to be out of the blood stream. It takes 7 years for your lungs to repair themselves from smoking an average of one pack a day. Any more then one pack a takes much longer and can hide many problems with health. I am a smoker and I smoke only a few cigarettes a day. I know its bad for me and I know its hard for me to quit but I am getting there with it and I will be smoke free in a month or two on how I have cut them out of my day.

Some smokers have no health problems other do its depends on the persons body not what everyone thinks you will have if you do smoke. Its like a Russian Roulette on your life and it can do allot of harm. Its why I want to quiet and am by looking at my habits with smoking. Like I used to wake up get dressed (5 minutes) and go out for a smoke. Now I wait over 4 hours before I have one. I also stopped smoking when I drink (that was hard). Then I stopped smoking when I had my coffee and daily Newspaper. Now I am have just stopped smoking in my car (I have never smoked in the car with my kids EVER and I use the other car when transporting them). Next thing I have to do is find a way to handle my stress instead of a smoke break when I am stressed out and I will be 100% smoke free.

Like all toxins,you wee and poo it out

48 hours.

Just like everything else and how it leaves the body. Going to the bathroom, also what helps clear your system of nicotine is vitamin C, plenty of water. Nicotine is out of a person system with in 24 hours, I have heard 8. The rest is psychological.

Many ways, the two biggest are urine, and fecal matter. But it also leaves the body in varying amounts through, sweat, tears, and breath. Of course this is in minute amounts.

Nicotine leaves the body through the waste-removal systems. It stays in your body for 72 to 96 hours, and when it leaves, the cravings will subside.

About 4/5Th's or 80 percent of the nicotine is broken down in your liver. The rest is either broken down you your lungs or is filtered through your kidneys. The half life for nicotine for the average person is 1 hour. The peak which happens soon after smoking is short lived and is what causes the addiction. The body craves nicotine when the levels drop below a certain point. Gum's, patches, and other treatments often give the user a low level of nicotine that doesn't give the addicting peak while staying above the crave point.

There are some people with a genetic disorder that causes the liver not to break down the nicotine which results in the concentration lasting much longer. In other words after smoking, they keep the peak much longer and could go a long time between smokes without cravings. The downside is that if they were to smoke like other smokers, they would die from the high toxicity of nicotine.